Detcon CXT-DM - Manual (Page 16)

Model CXT-DM
codes. Proper electrical installation of the gas sensor is critical for conformance to electrical codes and to
avoid damage due to water leakage.
If a conduit run exists a drain should be incorporated. The drain allows H
2
O condensation inside the conduit
run to safely drain away from the sensor assembly. The electrical seal fitting is required to meet the National
Electrical Code per NEC Article 500-3d (or Canadian Electrical Code Handbook Part 1 Section 18-154).
Requirements for locations of electrical seals are covered under NEC Article 501-5. Electrical seals also act as
a secondary seal to prevent water from entering the wiring terminal enclosure. However, they are not designed
to provide an absolute watertight seal, especially when used in the vertical orientation.
NOTE: A conduit seal is typically required to be located within 18" of the J-Box and Sensor
Assembly. Crouse Hinds type EYS2, EYD2 or equivalent are suitable for this purpose.
NOTE: The Detcon Warranty does not cover water damage resulting from water leaking into
the enclosure.
NOTE: Any unused ports should be blocked with suitable ¾” male NPT plugs. Detcon
supplies one ¾” NPT male plug with each J-box enclosure. If connections are other than ¾”
NPT, use an appropriate male plug of like construction material.
If the Detcon CXT-DM was ordered with one of the optional Battery Packs, no wiring is necessary, although
an external 24V source can be applied in some instances. If an external power source is incorporated, wire the
external power source to the Terminal Interconnect board as prescribed in Figure 13.
CAUTION: Do not apply System power to the sensor until all wiring is properly terminated. Refer
to Section 2.6 Initial Start Up
Applying power to the unit
1. Remove the junction box cover.
2. If external power is to be applied to the unit, connect incoming 24V to the terminal labeled “+” and 24V
Return to the terminal labeled “-”.
3. Install the batteries:
NOTE
The safety approvals require removing entire sensor assembly to a non-hazardous area
before installing or changing out the batteries or battery pack.
a) For units utilizing the 12V Smart Battery Pack, plug the battery pack into the Terminal Board. If
the sensor has a power switch, power will not be applied until the switch is turned on. If the unit
does not have a power switch, power will be applied, and the unit will proceed to power up
(Section 2.6).
b) If the unit utilizes the “C” sized lithium 3.6V batteries and battery holder, install the batteries
being careful to install the batteries properly. If the sensor has a power switch, power will not be
applied until the switch is turned on. If the unit does not have a power switch, power will be
applied, and the unit will proceed to power up (Section 2.6).
4. Replace the junction box cover after Initial Start Up.
CXT-DM Instruction Manual Rev. 1.6 Page 12 of 52